Dry hole sound wave test probe with signal amplification function

Abstract

The invention relates to a dry hole sound wave test probe with a signal amplification function. The probe comprises a vibration pickup assembly and a signal amplifier which are sequentially arranged in the front-back direction, the front end of the vibration pickup assembly is provided with a first plug, the signal amplifier is fixedly sleeved with a second plug in a sealed mode, the vibration pickup assembly is sleeved with a water storage bag, and the two ends of the water storage bag are fixed to the first plug and the second plug in a sealed mode respectively. A water through hole communicated with the water storage bag is formed in the second plug; the signal amplifier comprises an amplifier shell and an amplifier element in the amplifier shell, the amplifier element comprises a pre-amplifier, a filter and a differential amplifier which are sequentially connected in series, and the pre-amplifier, the filter and the differential amplifier sequentially perform amplification, filtering and differential signal conversion on signals of the vibration pickup assembly. And the signal amplifier is utilized to ensure undistorted transmission of weak signals of the vibration pickup assembly, so that the test precision and quality are improved.

Description

Technical Field

[0001] The invention relates to the technical field of in-hole acoustic wave testing equipment for geophysical exploration, and in particular to a dry hole acoustic wave testing probe with a signal amplification function. Background Art

[0002] At present, drilling exploration is often used in engineering geological surveys, and the workload of in-hole acoustic wave testing is very large. The following difficulties will be encountered during acoustic wave testing: When conducting acoustic wave testing in a borehole, the vibrator is fully coupled with the hole wall with water. If it encounters an upward inclined hole or a horizontal hole, it is difficult to preserve water in the hole. The rock mass of some downward inclined holes and plumb holes is broken, and there is often no water in the hole, which makes it impossible to complete the in-hole acoustic wave testing work.

[0003] The acoustic dry hole test probes currently on the market generally have three signal lines, one connected to the ultrasonic transmitting probe, and the other two connected to two ultrasonic receiving probes, all for "upward inclined holes". The characteristics of this type of probe are: during the test, a capsule is installed under the probe, and the bottom of the probe is sealed by inflating the capsule, and then water is pumped into the hole on the upper part of the capsule through the upper water pipe. When the water submerges the top probe, the three probes are fully coupled with the hole wall, and the test can be carried out; after the test is completed, the air in the capsule is released, the capsule is detached from the hole wall, and the water flows down naturally by gravity, and then the probe can be moved to the next test point. Since the hole needs to be frequently filled and drained, the staff under the hole are often drenched, especially in winter. The above test methods sometimes cause the airbag to be squeezed due to excessive water injection, and sometimes cause poor coupling effect due to insufficient water injection. The overall operation is cumbersome and complicated, and the promotion effect is not good.

[0004] In the prior art, for example, a Chinese invention patent application with application announcement number CN114994747A discloses “a gravity-type dry-hole acoustic wave probe”, which includes a vibrator, a bladder, an inlet and outlet pipe, a plug, a porous connector and a vibrator signal line; the acoustic wave probe is sequentially provided with a first vibrator, a second vibrator and a third vibrator, the first vibrator transmits a signal, and the other two receive a signal, and the vibrators are connected by screws through a porous connector; the first plug and the third vibrator are respectively connected by screws at the free ends of the first vibrator and the third vibrator Two plugs, a vibration pickup, a porous connector and a bag are provided on the outside of the plug, and two ends of the bag are respectively closed and connected to the side outer peripheral walls of the two plugs, and the inlet and outlet pipes and the vibration pickup signal line pass through the first plug into the inner cavity of the bag, and water is injected and discharged into the bag through the inlet and outlet pipes. The water injection makes the bag contact with the hole wall, and the vibration pickup realizes the upward inclined dry hole acoustic wave test through water coupling. After the test, the water in the bag is discharged through the inlet and outlet pipes by gravity to avoid the tester from being drenched. In addition, the bag is in contact with the hole wall to ensure the coupling effect and the survey accuracy.

[0005] When the above gravity-type dry-hole sonic probe is actually used, the electrical signal intensity output by the ceramic tube of the vibration pickup is relatively weak. For large-scale field and deep well testing scenarios, the signal line of the sonic probe is often inevitably long, and the long-distance signal transmission will cause the signal to attenuate further. Through testing, the above-mentioned sonic probe is only suitable for holes with a depth range of 150 meters. However, in some deep-well hole sonic tests in oil production, the vibration pickup needs to be located thousands of meters underground. During the transmission process, the signal amplitude will drop significantly, resulting in signal distortion, which seriously affects the accuracy and reliability of the test results and cannot meet the testing needs of deeper boreholes. Summary of the invention

[0006] The technical problem to be solved by the present invention is to provide a dry hole acoustic wave test probe with a signal amplification function, which uses a signal amplifier to effectively enhance the signal strength, remove noise and convert the signal into a balanced differential signal, thereby improving the signal quality, improving the test accuracy and meeting the deep hole testing requirements.

[0007] In view of the above technical problems, the technical solution provided by the present invention is a dry hole acoustic wave test probe with a signal amplification function, comprising a vibration pickup assembly and a signal amplifier arranged in sequence along the front-to-back direction, a first plug is provided at the front end of the vibration pickup assembly, a second plug is provided on the sealing and fixing sleeve of the signal amplifier, a water storage bag is provided on the outer sleeve of the vibration pickup assembly, the two ends of the water storage bag are respectively sealed and fixed with the first plug and the second plug, and a water hole connected to the water storage bag is provided on the second plug; the signal amplifier comprises an amplifier housing and an amplifier element therein, an input end of the amplifier element and an output end of the vibration pickup assembly are connected through a vibration pickup signal line, an output end of the amplifier element is connected to an amplifier signal line, and the amplifier element comprises a preamplifier, a filter and a differential amplifier connected in series in sequence, and the preamplifier, the filter and the differential amplifier amplify, filter and convert the signal of the vibration pickup assembly into a differential signal in sequence.

[0008] Furthermore, the amplifier signal line is a twisted pair line.

[0009] Furthermore, a matching circuit is provided at the output end of the differential amplifier, and the matching circuit receives a balanced differential signal of the differential amplifier and adjusts the output impedance of the signal so that the output impedance matches the characteristic impedance of the twisted pair.

[0010] Furthermore, the filter includes a high-pass filter, a band-pass filter and a low-pass filter.

[0011] Furthermore, the high-pass filter, the band-pass filter and the low-pass filter are sequentially connected in series, and the input end of the high-pass filter is connected to the output end of the preamplifier.

[0012] Furthermore, the outer contour of the first plug includes a large diameter section, a middle diameter section and a small diameter section from front to back, the front end of the water storage bag is sleeved on the middle diameter section and sealed and fixed by an explosion-proof capsule, the outer diameter of the small diameter section is adapted to the outer diameter of the vibration pickup assembly, and the outer diameter of the large diameter section is adapted to the outer diameter of the explosion-proof capsule.

[0013] Furthermore, the outer diameter of the amplifier housing is adapted to the outer diameter of the pickup assembly, the outer diameter of the second plug is adapted to the middle diameter section of the first plug, and the rear end of the water storage bag is sleeved on the outer periphery of the second plug and sealed and fixed by the explosion-proof bag.

[0014] Furthermore, the front end of the large diameter section is provided with a tapered front end, and the rear end of the amplifier housing is provided with a tapered tail.

[0015] Furthermore, an air outlet hole penetrating along the front-to-back direction is provided in the middle of the first plug, a lifting eye screw is threadedly connected to the front end of the air outlet hole, and the lifting eye screw is sealed and matched with the air outlet hole.

[0016] Furthermore, a protective ring is sleeved on the rear of the second plug, a connector is fixedly provided on the rear of the amplifier housing, a connecting hole is provided on the connector at a position corresponding to the water hole, and an inlet and outlet pipe is connected between the connecting hole and the water hole.

[0017] Furthermore, the inner surface of the water storage bag is rough and the outer surface is smooth.

[0018] Compared with the prior art, the beneficial effects of the present invention are:

[0019] (1) The pickup assembly and the signal amplifier are arranged in sequence along the front-to-back direction, and a water storage bag is provided and sealed and fixed with a plug to form an integral structure, which is not only conducive to the effective coupling between the acoustic wave probe and the hole wall under different drilling environments, but also can timely amplify and process the weak signal output by the pickup assembly. The preamplifier, filter and differential amplifier inside the signal amplifier amplify, filter and convert the signal into a differential signal in turn, which can effectively enhance the signal strength, remove noise and convert the signal into a balanced differential signal with strong anti-interference ability, thereby improving the reliability and accuracy of the entire acoustic wave test probe in complex environments, ensuring that the received signal is not distorted during long-distance transmission, and improving the quality and recognizability of the signal, thereby more accurately obtaining the acoustic wave information in the hole, ensuring the accuracy and reliability of the survey data, and facilitating the accurate analysis of geological structure and other information in engineering geological surveys. It is more suitable for large-scale field and deep well testing and other scenes with high requirements for signal quality.

[0020] (2) Using twisted pair cables as amplifier signal lines, the characteristics of twisted pair cables can effectively suppress common mode noise and reduce signal interference during transmission, further ensuring the stability and accuracy of signal transmission, so that the amplified and processed signals can be more reliably transmitted to the receiving device. Even in the case of long-distance transmission or external electromagnetic interference, the risk of signal distortion can be reduced, thereby improving the credibility of the test results.

[0021] (3) A matching circuit is set at the output end of the differential amplifier to accurately adjust the output impedance of the signal to match the characteristic impedance of the twisted pair. This design can minimize the reflection of the signal during transmission and avoid changes in signal amplitude and phase caused by impedance mismatch, thereby ensuring that the signal is transmitted in the twisted pair with minimal loss and distortion, ensuring the quality of long-distance signal transmission, enabling the acoustic wave test probe to adapt to the testing needs of deeper drilling, and improving the applicability and versatility of the probe in different engineering environments.

[0022] (4) The high-pass filter can filter out low-frequency interference, the band-pass filter can accurately screen out specific frequency bands related to the acoustic signal, and the low-pass filter can remove high-frequency noise, thereby effectively purifying the signal collected by the vibration pickup assembly and improving the signal-to-noise ratio of the signal, providing a better signal source for subsequent signal amplification and analysis, helping to more accurately obtain the acoustic information in the borehole and improve the accuracy of engineering geological surveys.

[0023] (5) The high-pass filter, band-pass filter and low-pass filter are connected in series, and the input of the high-pass filter is connected to the input of the preamplifier, forming a complete and orderly signal filtering chain. This series connection method can process the signal step by step according to the signal frequency characteristics, and filter out unnecessary interference signals from low frequency to high frequency, so that after a series of filtering, the signal only retains the effective information within the target sound wave signal frequency band, thereby improving the performance and stability of the entire signal processing system. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a schematic diagram of the overall structure and appearance of a dry hole acoustic wave test probe with a signal amplification function in Example 1 of the present invention.

[0025] Figure 2 It is a cross-sectional view of a dry hole acoustic wave test probe with a signal amplification function in Example 1 of the present invention.

[0026] Figure 3 It is a schematic diagram of the structural appearance of the vibration pickup assembly and the signal amplifier in Example 1 of the present invention.

[0027] Figure 4 It is a schematic diagram of the structure and appearance of the signal amplifier in Example 1 of the present invention.

[0028] Figure 5 It is a diagram showing the composition of the amplifier element in Embodiment 1 of the present invention.

[0029] Figure 6 It is a composition diagram of the filter in Example 1 of the present invention.

[0030] Figure 7 It is a cross-sectional view of the first plug in Example 1 of the present invention.

[0031] Figure 8 It is a schematic diagram of the structural appearance of the second plug in Example 1 of the present invention.

[0032] Fig. 9 It is a schematic structural appearance diagram of the connector in Example 1 of the present invention.

[0033] Fig.10 It is a structural schematic diagram of the dry hole acoustic wave test probe installed in the water storage tank in Example 1 of the present invention.

[0034] Fig.11 It is a cross-sectional view of a dry hole acoustic wave test probe installed in a water reservoir in Example 1 of the present invention.

[0035] Fig.12 It is a schematic diagram of the structure and appearance of the water storage device in Example 1 of the present invention.

[0036] Fig.13 It is a cross-sectional view of the water storage container in Example 1 of the present invention.

[0037] Fig.14 It is a first direction axial view of the first plug of the water storage tank in Example 1 of the present invention.

[0038] Fig.15 It is a second direction axonometric view of the first plug of the water storage tank in Example 1 of the present invention.

[0039] Fig.16 It is a first direction axonometric view of the second plug of the water storage tank in Example 1 of the present invention.

[0040] Fig.17 It is a second direction axonometric view of the second plug of the water storage tank in Example 1 of the present invention.

[0041] Fig.18 It is a schematic diagram of the structure and appearance of the guide in Example 1 of the present invention.

[0042] Fig.19 It is a schematic diagram of the structural appearance of the first vibration pickup in Example 1 of the present invention.

[0043] Fig. 20 It is a schematic diagram of the structural appearance of the second porous connector in Example 1 of the present invention.

[0044] In the figure: 1, sonic probe assembly; 11, vibration pickup assembly; 111, first vibration pickup; 112, second vibration pickup; 113, third vibration pickup; 114, first porous connector; 115, second porous connector; 116, high-strength fiber; 121, first plug; 1211, air outlet; 122, second plug; 123, protective ring; 124, eye screw; 125, explosion-proof capsule; 126, water hole; 13, water storage bag; 15, signal line; 151, vibration pickup signal line; 152, amplifier signal line; 153, extension section;

[0045] 2. water storage tank; 21. water storage tank shell; 211. columnar shell; 212. first plug of water storage tank; 213. second plug of water storage tank; 214. through hole; 215. inner extension ring; 22. water inlet; 23. air filling port; 24. water inlet; 25. hollow shaft; 251. wire groove; 26. first capillary steel tube; 27. second capillary steel tube; 28. third capillary steel tube; 29. ​​inflatable airbag; 210. water storage space;

[0046] 3. Connecting pipe; 4. Connector; 41. Connecting hole; 5. Inlet and outlet pipe; 6. Water inlet pipe; 7. Inlet and outlet pipe;

[0047] 8. Guide; 81. First guide hole; 82. Second guide hole; 9. Columnar nut; 10. Signal amplifier; 101. Amplifier housing; 1011. Mounting hole; 1012. Screw hole; 1013. Conical tail;

[0048] 102, amplifier element; 1021, preamplifier; 1022, filter; 1023, differential amplifier; 1024, matching circuit; 1025, high-pass filter; 1026, band-pass filter; 1027, low-pass filter. DETAILED DESCRIPTION

[0049] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present application: Specific embodiment 1:

[0051] refer to Figures 1 to 20The present invention discloses a dry hole acoustic wave test probe with a signal amplification function (hereinafter referred to as the test probe), comprising an acoustic wave probe assembly 1 and a water reservoir 2 which are sequentially arranged and detachably connected along the front-back direction, wherein the acoustic wave probe assembly 1 comprises a vibration pickup assembly 11, a first plug 121 and a second plug 122 respectively arranged at both ends of the vibration pickup assembly 11, a high-strength fiber 116 connecting adjacent vibration pickups, and a water storage bag 13 sleeved on the outside of the vibration pickup assembly 11, and the two ends of the water storage bag 13 are respectively sealed and fixed with the first plug 121 and the second plug 122, explosion-proof capsules 125 are sleeved on the outer sides of the two ends of the water storage bag 13, and the first plug 121 is provided with an air outlet 1211 and a lifting eye screw 124. In this way, a closed space is formed in the water storage bag 13. In actual use, water is firstly filled into the water storage bag 13 to exhaust the internal air, and the test probe can be inserted into the test borehole after the lifting eye screw 124 is screwed on. Continue to inject water into the water storage bag, the water storage bag 13 expands and fully contacts the hole wall, the vibration pickup assembly 11 is coupled with the hole wall through the water, and then the acoustic wave test can be performed on the point.

[0052] Moreover, in this embodiment, the first plug 121, the second plug 122, the vibration pickup assembly 11 and the water storage bag 13 are arranged concentrically, so that the vibration pickup assembly 11 can be located in the middle of the borehole during testing, thereby enhancing the strength of the first arrival signal of the longitudinal wave and improving the signal quality.

[0053] In this embodiment, if Fig.12 , 13 As shown, the water reservoir 2 includes a water reservoir housing 21, a hollow shaft 25 inserted and fixed in the water reservoir housing 21, and an inflatable airbag 29 sleeved on the outside of the hollow shaft 25. The signal line 15 of the vibration pickup assembly 11 extends backward through the hollow shaft 25 to connect with external equipment, and the two ends of the inflatable airbag 29 are respectively sealed and fixed to the two ends of the water reservoir housing 21, and a water storage space 210 is formed between the water reservoir housing 21, and water is stored in the water storage space 210. The front and rear ends of the water reservoir housing 21 are respectively provided with a water inlet 22 connected to the water storage space 210 and an air inlet 23 connected to the inflatable airbag 29. The water inlet 22 is sealed and connected to the water storage bag 13.

[0054] The rear part of the acoustic wave probe assembly 1 is connected to the water reservoir 2, and a water storage space 210 is formed between the inflatable airbag 29 of the water reservoir 2 and the water reservoir shell 21. In actual use, the test probe goes deep into the hole. When the test probe reaches the specified position, it is inflated through the inflation port 23, the inflatable airbag 29 expands, and the water in the water storage space 210 is squeezed and enters the water storage bag 13 through the water outlet 22, so that the water storage bag 13 is in full contact with the hole wall. The water storage bag 13 is explosion-proof protected by the explosion-proof capsule 125, and the vibration pickup is coupled with the hole wall through water, so that the acoustic wave test can be carried out. After the data collection is completed, the inflation port 23 is deflated, and the inflatable airbag 29 retracts, so that the water in the water storage bag 13 flows back to the water storage space 210, the water storage bag 13 retracts and separates from the hole wall, and the acoustic wave probe can be moved to the next test point. The test probe can perform sonic testing on boreholes at any angle, and there is no need to set up an additional water pump or water source. It only needs to be inflated and deflated, which is convenient and fast for testing.

[0055] The water storage container with a rigid shell is arranged at the rear of the sonic wave probe assembly, which can facilitate the sonic wave probe assembly to be placed in the upper inclined hole. The two can be detachably connected, which is convenient for carrying and transportation.

[0056] Specifically, in this embodiment, Figure 2 , 3 As shown, the vibration pickup assembly 11 includes three vibration pickups, namely a first vibration pickup 111, a second vibration pickup 112 and a third vibration pickup 113 arranged in sequence along the front-to-back direction, wherein the third vibration pickup 113 is used to transmit signals, and the first vibration pickup 111 and the second vibration pickup 112 are used to receive signals.

[0057] Adjacent vibration pickups are connected by porous connectors, and the porous connectors include a first porous connector 114 detachably connected between the first vibration pickup 111 and the second vibration pickup 112, and a second porous connector 115 detachably connected between the second vibration pickup 112 and the third vibration pickup 113. Fig. 20 As shown, the first porous connector 114 is similar to the second porous connector 115, both of which are cylindrical thin-walled cavity tube structures with multiple gaps on their side walls. The gaps can prevent the second vibrator 112 and the third vibrator 113 from receiving interference signals that propagate directly along the porous connector, thereby improving the signal-to-noise ratio.

[0058] In this embodiment, if Figure 2 , 3As shown in Figures 1 and 19, an extension section 153 is respectively provided at the front and rear ends of the vibration pickup, and the front and rear ends of the porous connector are respectively inserted into the corresponding extension section 153 of the vibration pickup and fixedly connected by screws. In this embodiment, the first porous connector 114 and the second porous connector 115 are both nylon connecting parts. The wave velocity of nylon material is relatively lower than that of rigid material. In order to prevent the porous connector between adjacent vibration pickups from being pulled apart when the water storage bag 13 expands, high-strength fibers 116 are also connected between adjacent vibration pickups. Specifically, three high-strength fibers 116 are arranged in an axial annular array between adjacent vibration pickups to increase the overall service life of the sound wave probe. At the same time, when the water storage bag 13 is filled with water and expands, the nylon porous connector is easily stretched, which in turn causes the distance between adjacent vibration pickups to become longer, resulting in a long propagation time of sound waves. Therefore, the use of high-strength fibers 116 can also prevent the distance between adjacent vibration pickups from changing, resulting in inaccurate calculated wave velocity.

[0059] In this embodiment, if Figure 2 , 7 As shown, the rear part of the first plug 121 is provided with a notch adapted to the extension section 153 of the first vibration pickup 111, and the notch is sleeved on the extension section 153 at the front end of the first vibration pickup 111 and fixedly connected by screws. An air outlet 1211 is provided in the middle part of the first plug 121, which is through in the front-to-back direction. The air outlet 1211 is connected to the water storage bag 13. The front end of the air outlet 1211 is threadedly connected with a lifting eye screw 124, and the lifting eye screw 124 and the air outlet 1211 are sealed by a sealing gasket. In this way, when actually using it, first arrange the front end of the sonic probe assembly 1 upward, unscrew the lifting eye screw 124, and at the same time, fill water into the water storage bag 13. When water overflows from the upper end of the first plug 121, it indicates that the air inside the water storage bag 13 has been emptied.

[0060] In this embodiment, if Figure 1 , 7 As shown, the outer contour of the first plug 121 includes a large diameter section, a middle diameter section and a small diameter section from front to back, the front end of the water storage bag 13 is sleeved on the middle diameter section, and an explosion-proof capsule 125 is provided to fix and seal to prevent falling off, and the explosion-proof capsule 125 can prevent the water storage bag 13 from suddenly becoming larger at a fixed position when the water storage bag 13 is filled with water and expanded, causing the water storage bag 13 to burst. The outer diameter of the small diameter section is flush with the outer diameter of the vibration pickup assembly 11, and the extension section 153 at the front end of the first vibration pickup 111 is inserted into the inner ring of the small diameter section and fixedly connected with screws.

[0061] By utilizing the diameter difference between the small diameter section and the middle diameter section of the first plug 121, the water storage bag 13 and the vibration pickup assembly 11 can be arranged at intervals, so as to avoid the screws used for fixing each vibration pickup and the porous connector, the vibration pickup assembly and the first plug and the second plug from directly contacting the water storage bag 13, which is beneficial to protecting the water storage bag 13. The outer periphery of the large diameter section is flush with the outer periphery of the explosion-proof capsule 125, and a tapered structure is provided at the front of the large diameter section to facilitate entry and exit of the test borehole.

[0062] In this embodiment, if Figure 2 , 3 As shown in Figures 4, 10 and 11, a signal amplifier 10 is arranged between the sound wave probe assembly 1 and the water tank 2. The signal amplifier 10 includes a columnar amplifier housing 101 and an amplifier element 102 arranged in the amplifier housing 101. The sound wave probe assembly 1 and the water tank 2 are respectively fixed at two ends of the amplifier housing 101. The signal line 15 includes a pickup signal line 151 and an amplifier signal line 152. The pickup signal line 151 connects the output end of the pickup assembly 11 and the input end of the amplifier element 102. The amplifier signal line 152 connects the output end of the amplifier element 102 and extends backward to connect to an external receiving device.

[0063] Specifically, in this embodiment, if Figure 4 As shown, the front end of the amplifier housing 101 is provided with a mounting hole 1011 adapted to the extension section 153 of the third vibration pickup 113, the outer diameter of the amplifier housing 101 is adapted to the outer diameter of the vibration pickup assembly, the amplifier housing 101 is provided with a screw hole 1012 at a position corresponding to the mounting hole 1011, the rear end of the third vibration pickup 113 is inserted deep into and fixedly connected to the front end of the amplifier housing 101 by screws screwed into the screw hole 1012, and the vibration pickup signal line 151 is inserted into the amplifier housing 101 through the mounting hole 1011 and connected to the amplifier element 102 inside it. In this way, the vibration pickup assembly 11 and the signal amplifier 10 are fixedly arranged in sequence along the front-to-back direction.

[0064] In this embodiment, if Figure 1 , 2 As shown in Figures 8, the inner diameter of the second plug 122 is matched with the outer diameter of the amplifier housing 101, and the outer diameter of the second plug 122 is matched with the middle diameter section of the first plug 121. Screw holes 1012 are provided on the circumference of the amplifier housing 101 at positions corresponding to the second plug 122. The second plug 122 is mounted on and removably fixed to the front of the amplifier housing 101 by screws screwed into the corresponding screw holes 1012, and is sealed with the amplifier housing 101.

[0065] In this embodiment, a water hole 126 communicating with the water storage bag 13 is opened on the end surface of the second plug 102 along its axial direction, and water is injected into the water storage bag 13 through the water hole 126 to perform a coupling test.

[0066] Preferably, Figure 1 , 8 As shown in Figures 9 and 10, in this embodiment, a protective ring 123 is fixedly provided on the outer periphery of the rear portion of the second plug 122, and the outer diameter of the protective ring 123 matches the large diameter section of the first plug 121 to form a variable diameter structure. A cylindrical connector 4 is fixedly provided on the rear portion of the amplifier housing 101, and the inner diameter of the connector 4 matches the outer diameter of the amplifier housing 101, and the outer diameter of the connector 4 matches the outer diameter of the protective ring 123. A connecting hole 41 is provided at a position of the connector 4 corresponding to the water hole 126, and the connecting hole 41 is arranged concentrically with the water hole 126. An inlet and outlet pipe 5 is connected between the connecting hole 41 and the water hole 126, and the rear end of the inlet and outlet pipe 5 is used to connect to the water port of the water storage tank 2.

[0067] The protective ring 123 is sleeved on the rear of the second plug 122 to protect the signal amplifier 10 to a certain extent, preventing the signal amplifier 10 from being damaged by collision or friction during operation in the borehole. The water hole 126 and the connecting hole 41 are connected to the water inlet and outlet pipe 5, ensuring the water communication between the water storage bag 13 and the water storage tank 2, so that the water filling and drainage operations can be carried out smoothly, which is conducive to controlling the water volume and pressure in the water storage bag 13, thereby achieving good coupling between the acoustic wave probe and the hole wall, and improving the operability and functionality of the probe.

[0068] In this embodiment, the rear end of the water storage bag 13 is sleeved on the second plug 122 and sealed and fixed by the explosion-proof capsule 125. At the same time, the outer periphery of the explosion-proof capsule 125 is aligned with the outer periphery of the protective ring 123 to ensure that the water storage bag 13 is an equal-diameter columnar structure.

[0069] Preferably, in the present embodiment, the inner surface of the water storage bag 13 is roughened, which can increase the friction between the water storage bag 13 and the plug assembly, thereby ensuring that the water storage bag 13 is not easy to fall off.

[0070] The outer surface of the water storage bag 13 is smooth and flat, which is conducive to the coupling of the columnar water storage bag 13 with the hole wall, improving the signal quality, and at the same time reducing the friction resistance between the water storage bag 13 and the hole wall when moving in the borehole, facilitating the insertion and removal of the test probe and reducing the risk of the water storage bag being scratched.

[0071] In this embodiment, if Figure 5 , 6As shown, the amplifier element 102 includes a preamplifier 1021, a filter 1022 and a differential amplifier 1023 connected in series, wherein the preamplifier 1021, the filter 1022 and the differential amplifier 1023 sequentially amplify, filter and convert the signal of the vibration pickup assembly 11 into a differential signal. It can effectively enhance the signal strength, remove noise and convert the signal into a balanced differential signal with strong anti-interference ability, improve the reliability and accuracy of the entire acoustic wave test probe in complex environments, ensure that the received signal is not distorted during long-distance transmission, improve the quality and recognizability of the signal, thereby more accurately obtaining the acoustic wave information in the hole, ensuring the accuracy and reliability of the survey data, facilitating the accurate analysis of geological structure and other information in engineering geological survey work, and more suitable for large-scale field and deep well testing and other scenes with high signal quality requirements.

[0072] Specifically, in this embodiment, the amplifier signal line 152 is a twisted pair, which can effectively suppress common mode noise and reduce signal interference during transmission by utilizing the characteristics of the twisted pair, further ensuring the stability and accuracy of signal transmission, so that the amplified and processed signal can be more reliably transmitted to the receiving device, and even in the case of long-distance transmission or external electromagnetic interference, the risk of signal distortion can be reduced, and the received weak signal can be transmitted over a longer distance, thereby ensuring the quality of deep hole detection and improving the credibility of the test results.

[0073] Preferably, in this embodiment, a matching circuit 1024 is further provided at the output end of the differential amplifier 1023, and the matching circuit 1024 receives the balanced differential signal of the differential amplifier and adjusts the output impedance of the signal so that the output impedance matches the characteristic impedance of the twisted pair. This design can minimize the reflection phenomenon of the signal during transmission, avoid the change of signal amplitude and phase caused by impedance mismatch, thereby ensuring that the signal is transmitted in the twisted pair with minimum loss and distortion, ensuring the quality of long-distance signal transmission, enabling the acoustic wave test probe to adapt to the test requirements of deeper drilling, and improving the applicability and versatility of the probe in different engineering environments.

[0074] In this way, due to the anti-interference of the differential signal and the good transmission conditions after matching, when the signal is transmitted on the twisted pair, the common mode noise is suppressed and the distortion is small, so that it can be transmitted without distortion over a longer distance, ensuring that the signal can still be effectively received and processed after long-distance transmission.

[0075] Preferably, in this embodiment, the filter 1022 includes a high-pass filter 1025, a band-pass filter 1026 and a low-pass filter 1027. The high-pass filter 1025 can filter out low-frequency interference, the band-pass filter 1026 can accurately filter out a specific frequency band related to the sound wave signal, and the low-pass filter 1027 removes high-frequency noise, thereby effectively purifying the signal collected by the vibration pickup assembly 11, improving the signal-to-noise ratio of the signal, providing a better signal source for subsequent signal amplification and analysis, helping to more accurately obtain the sound wave information in the borehole, and improving the accuracy of engineering geological surveys.

[0076] Specifically, in the present embodiment, the input and output of the high-pass filter 1025, the band-pass filter 1026 and the low-pass filter 1027 are sequentially connected in series, and the input of the high-pass filter 1025 is connected to the output of the preamplifier 1021, and the output of the low-pass filter 1027 is connected to the input of the differential amplifier 1023. The amplified signal input from the preamplifier 1021 first enters the high-pass filter 1025 to filter out low-frequency interference, and then further screens out the target sound wave frequency band through the band-pass filter 1026, and finally removes the residual high-frequency noise with the low-pass filter 1027, forming a complete and orderly signal filtering chain. The signal quality is maximized and fine filtering is achieved. The performance and stability of the entire signal processing system are improved. Of course, in other embodiments, according to actual use requirements, the filter 1022 in which the high-pass filter 1025, the band-pass filter 1026 and the low-pass filter 1027 are connected in parallel can also be selected.

[0077] In this embodiment, if Figure 2 , 4 As shown in , 7, the outer diameter of the large diameter section of the first plug 121 is adapted to be flush with the outer diameter of the explosion-proof capsule 125, a tapered front end is provided at the front of the large diameter section, and a tapered tail 1013 is provided at the rear end of the amplifier housing 101 to facilitate entry and exit of the test borehole.

[0078] In this embodiment, if Fig.12 , 13 As shown, the water tank shell 21 includes a columnar shell 211, and the front and rear ends of the columnar shell 211 are respectively provided with a first water tank plug 212 and a second water tank plug 213, wherein the centers of the first water tank plug 212 and the second water tank plug 213 are both provided with a through hole 214, and the hollow shaft 25 passes through the two through holes 214 from back to front in sequence, and is welded with the two through holes 214 to achieve fixation and sealing.

[0079] like Fig.14 , 15As shown in Figures 16 and 17, an inner extension ring 215 concentric with the penetration hole 214 is provided at the opposite ends of the first plug 212 and the second plug 213 of the water storage tank, and the two ends of the inflatable airbag 29 are respectively penetrated and sealed and fixed on the corresponding inner extension ring 215. An inflatable space is formed between the inflatable airbag 29 and the hollow shaft 25. Among them, the water inlet 22 is provided on the end surface of the first plug 212 of the water storage tank, and the water inlet 22 is connected to the water storage space 210 between the inflatable airbag 29 and the water storage shell 21.

[0080] The air filling port 23 is arranged on the end surface of the second plug 213 of the water storage tank, and specifically, the air filling port 23 is arranged on the portion of the second plug 213 of the water storage tank located inside its inner extension ring 215, that is, the air filling port 23 is arranged between the through hole 214 of the second plug 213 of the water storage tank and the inner circumference of the inner extension ring 215. In this way, the air filling port 23 is connected to the inflation space, and the air filling port 23 is in conduction with the inside of the inflation airbag 29.

[0081] In this embodiment, a water inlet 24 is provided at the position of the second plug 213 of the water storage device corresponding to the water storage space 210, and the water inlet 24 is arranged concentrically with the water passage 22. In this way, water can be introduced into and discharged from the water storage bag 13 and the water storage space 210 through the water inlet 24.

[0082] In this embodiment, if Fig.12 As shown, a connecting pipe 3 is provided at the front end of the water storage housing 21 , and the connecting pipe 3 is fixedly mounted on the amplifier housing 101 through a connector 4 .

[0083] Specifically, the connecting pipe 3 is a steel pipe, which is welded and fixed at the front end of the first plug 212 of the water tank. The outer diameter of the connecting pipe 3 is adapted to the outer diameter of the water tank shell 21. A first capillary steel tube 26 is arranged on the front side of the first plug 212 of the water tank corresponding to the position of the water port 22. The first capillary steel tube 26 is arranged inside the connecting pipe 3.

[0084] The outer periphery of the connector 4 is a stepped diameter-changing structure that is larger at the front and smaller at the rear. The inner diameter of the connector 4 is adapted to the outer diameter of the amplifier housing 101. The connector 4 is integrally sleeved on the rear of the amplifier housing 101. The rear small-diameter section of the connector 4 is inserted into the inner cavity of the connecting tube 3. A fastening hole is provided at the overlapping position of the connecting tube 3 and the connector 4. The connecting tube 3 and the connector 4 are fastened and installed in the screw hole 1012 at the rear of the amplifier housing 101 by means of fixing screws passing through the fastening holes to achieve fixation.

[0085] The rear end of the inlet and outlet pipe 5 is sealed and connected to the front end of the first capillary steel tube 26 of the water port 22, and the front end of the inlet and outlet pipe 5 passes through the connecting hole 41 and is connected to the water hole 126 of the second plug 122. Specifically, a hose is provided at the front end of the first capillary steel tube 26, and the inlet and outlet pipe 5 is an inlet and outlet hose, and the hose is connected to the inlet and outlet hose through a quick connection. The water hole 126, the connecting hole 41 and the water port 22 are connected through the inlet and outlet pipe 5, so that the water storage space 210 is connected to the water storage bag 13. At the same time, the protective ring 123 at the rear of the second plug 122 can be used to protect the inlet and outlet pipe 5.

[0086] In this embodiment, if Fig.16 , 17 As shown, a second capillary steel tube 27 and a third capillary steel tube 28 are respectively provided at the positions corresponding to the inflation port 23 and the water inlet 24 at the rear end of the second plug 213 of the water storage tank, Fig.12 The second capillary steel tube 27 is connected to the air inlet and outlet pipe 7, and the third capillary steel tube 28 is connected to the water inlet pipe 6. The rear end of the air inlet and outlet pipe 7 is extended to connect the external inflation device, and the water inlet pipe 6 is used to inject water into the water storage bag 13 and the water storage space 210 when the hole test is not performed.

[0087] In this embodiment, preferably, the rear end of the hollow shaft 25 extends out of the water storage housing 21 and is provided with a wire groove 251, through which the signal line 15 extends backward, and a columnar nut 9 is fixedly provided at the rear end of the hollow shaft 25, and a push rod is threadedly connected to the columnar nut 9. The push rod is used to drive the test probe to move in the hole.

[0088] In this embodiment, if Fig.12 , 18 As shown, a conical guide 8 with a larger front and a smaller rear is fixedly installed at the rear end of the water storage tank 2. The guide 8 is entirely passed through the hollow shaft 25 and the wire groove 251 is exposed. The front end of the guide 8 is fixedly welded to the rear end of the second plug 213 of the water storage tank, and the second capillary steel tube 27 and the third capillary steel tube 28 are welded. A first guide hole 81 and a second guide hole 82 are respectively opened on the central circumference of the guide 8 at positions corresponding to the inflation port 23 and the water inlet 24, and the water inlet pipe 6 and the air inlet and exhaust pipe 7 extend backwards through the corresponding guide holes.

[0089] How to use this application:

[0090] Step 1: Connect the signal line 15 to the external instrument.

[0091] Step 2: Use quick-connect to connect the rubber hose connected to the first capillary steel tube 26 to the water inlet and outlet rubber hoses on the front side of the water reservoir 2 to achieve communication between the water reservoir 2 and the water storage bag 13.

[0092] Step 3: Insert the rear end of the connector 4 into the front end of the connecting tube 3 and fasten it with the fixing screws to complete the assembly of the test probe.

[0093] Step 4: Before placing the test probe, make the front end of the acoustic wave probe assembly 1 higher than the water reservoir 2, remove the eye screw 124, and inject water into the water reservoir 2 through the water inlet pipe 6. When water flows out from the front end of the first plug 121, the water reservoir 2 and the water storage bag 13 are filled with water, and the air between the vibration pickup assembly 11 and the water storage bag 13 is also exhausted. At this time, the water injection is completed, the water inlet 24 is blocked, and the eye screw 124 is screwed on to complete the sealing to ensure that the water in the test probe does not flow out.

[0094] Step 5: Use a quick connector to connect the high-pressure air pipe connected to the air pump and the air inlet and outlet pipes 7 on the right side of the water storage tank 2.

[0095] Step 6: Send the inflatable dry hole sonic test probe to the test location.

[0096] Step 7: Use an air pump to inflate the high-pressure air pipe, so that the water in the water reservoir 2 is squeezed into the water storage bag 13, and the water storage bag 13 is in full contact with the hole wall. At this time, the test can be carried out.

[0097] Step 8: After the test is completed, the air is discharged, and the water in the water storage bag 13 flows back to the water reservoir 2. The water storage bag 13 is separated from the hole wall, and the inflatable dry hole acoustic wave test probe can be moved to the next test point. Repeat steps 7 and 8 until the test is completed.

[0098] Step 9: After the test is completed, pull out the test probe, open the eye screw 124 and the water inlet 24, and let all the internal water flow out freely.

[0099] Step 10: Remove the screws connecting the water reservoir 2 and the sonic probe assembly 1, separate the water reservoir 2 and the sonic probe assembly, and wind up the line to finish the work.

[0100] In summary, the test probe of the present invention can be applied to the acoustic wave testing of boreholes without water in all directions. No water source is needed on site, only an air pump is needed, and the application range is wide. The water reservoir 2 and the acoustic wave probe assembly 1 can be freely disassembled and assembled simply, which is convenient for transportation and practical. The signal amplifier 10 can ensure that the weak signal of the vibration pickup assembly 11 is transmitted to a longer distance without distortion, thereby improving the accuracy and quality of deep hole testing.

[0101] Of course, in other embodiments, the water reservoir may not be provided for the upper inclined hole. In this case, the water inlet and outlet pipes are directly connected to an external water pump.

[0102] The above are only preferred embodiments of the present application and are not intended to limit the present application. For those skilled in the art, the present application may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

[0103] In the description of the embodiments of the present application, it should be noted that if the terms "upper", "lower", "horizontal", "inner", etc. appear, the orientation or position relationship indicated is based on the orientation or position relationship shown in the drawings, or the orientation or position relationship in which the invented product is usually placed when used. It is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first", "second", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0104] In addition, if the term "horizontal" appears, it does not mean that the component must be absolutely horizontal, but can be slightly tilted. For example, "horizontal" only means that its direction is more horizontal than "vertical", which does not mean that the structure must be completely horizontal, but can be slightly tilted.

Claims

1. A dry hole acoustic wave test probe with signal amplification function, characterized in that: It comprises a vibration pickup assembly and a signal amplifier which are arranged in sequence along the front-to-back direction, wherein a first plug is arranged at the front end of the vibration pickup assembly, a second plug is provided on the sealing and fixing sleeve of the signal amplifier, a water storage bag is provided on the outer sleeve of the vibration pickup assembly, two ends of the water storage bag are respectively sealed and fixed to the first plug and the second plug, and a water hole which is connected to the water storage bag is provided on the second plug; the signal amplifier comprises an amplifier housing and an amplifier element inside the amplifier housing, an input end of the amplifier element and an output end of the vibration pickup assembly are connected through a vibration pickup signal line, an output end of the amplifier element is connected to an amplifier signal line, and the amplifier element comprises a preamplifier, a filter and a differential amplifier which are connected in series in sequence, and the preamplifier, the filter and the differential amplifier amplify, filter and convert the signal of the vibration pickup assembly into a differential signal in sequence.

2. The dry hole acoustic wave test probe with signal amplification function according to claim 1, characterized in that: The amplifier signal line is a twisted pair line.

3. The dry hole acoustic wave test probe with signal amplification function according to claim 2, characterized in that: The output end of the differential amplifier is provided with a matching circuit, which receives the balanced differential signal of the differential amplifier and adjusts the output impedance of the signal so that the output impedance matches the characteristic impedance of the twisted pair.

4. The dry hole acoustic wave test probe with signal amplification function according to claim 1, characterized in that: The filters include a high-pass filter, a band-pass filter and a low-pass filter.

5. The dry hole acoustic wave test probe with signal amplification function according to claim 4, characterized in that: The high-pass filter, the band-pass filter and the low-pass filter are connected in series in sequence, and the input end of the high-pass filter is connected to the output end of the preamplifier.

6. The dry hole acoustic wave test probe with signal amplification function according to claim 1, characterized in that: The outer contour of the first plug includes a large diameter section, a middle diameter section and a small diameter section from front to back. The front end of the water storage bag is sleeved on the middle diameter section and sealed and fixed by an explosion-proof capsule. The outer diameter of the small diameter section is adapted to the outer diameter of the vibration pickup assembly, and the outer diameter of the large diameter section is adapted to the outer diameter of the explosion-proof capsule.

7. The dry hole acoustic wave test probe with signal amplification function according to claim 6, characterized in that: The outer diameter of the amplifier housing is matched with the outer diameter of the vibration pickup assembly, the outer diameter of the second plug is matched with the middle diameter section of the first plug, and the rear end of the water storage bag is sleeved on the outer periphery of the second plug and sealed and fixed by the explosion-proof bag.

8. The dry hole acoustic wave test probe with signal amplification function according to claim 7, characterized in that: The front end of the large diameter section is provided with a tapered front end, and the rear end of the amplifier housing is provided with a tapered tail.

9. The dry hole acoustic wave test probe with signal amplification function according to claim 1, characterized in that: An air outlet hole penetrating along the front-to-back direction is provided in the middle of the first plug, a lifting eye screw is threadedly connected to the front end of the air outlet hole, and the lifting eye screw is sealed with the air outlet hole.

10. The dry hole acoustic wave test probe with signal amplification function according to claim 1, characterized in that: A protective ring is sleeved on the rear of the second plug, a connector is fixedly arranged on the rear of the amplifier housing, a connecting hole is arranged on the connector at a position corresponding to the water hole, and an inlet and outlet pipe is connected between the connecting hole and the water hole.

11. The dry hole acoustic wave test probe with signal amplification function according to claim 1, characterized in that: The inner surface of the water storage bag is rough and the outer surface is smooth.

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